UITextField+CharactersLimit.swift

// UITextField+CharactersLimit.swift
// https://gist.github.com/konnnn/0caf0f08c2c800cf409aecac14f04c18

import UIKit

// Limit = 15 characters
extension TextField: UITextFieldDelegate {
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        guard let text = textField.text else { return true }
        let newLength = text.count + string.count - range.length
        return newLength <= 15
    }
}